#pragma once

#include <iostream>
#include <cstdlib>
#include <cstring>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <pthread.h>
#include "Log.hpp"

#define BACKLOG 5

class TcpServer
{
private:
    int port;
    int listen_sock;
    static TcpServer *svr;

private:
    TcpServer(int _port) : port(_port), listen_sock(-1)
    {
    }
    TcpServer(const TcpServer &s) {}

public:
    static TcpServer *Getinstance(int port)
    {
        static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
        if (nullptr == svr)
        {
            pthread_mutex_lock(&lock);
            if (nullptr == svr)
            {
                svr = new TcpServer(port);
                svr->InitServer();
            }
            pthread_mutex_unlock(&lock);
        }
        return svr;
    }
    void InitServer()
    {
        Socket();
        Bind();
        Listen();
        LOG(INFO, "tcp_server init ... success");
    }

    //创建套接字
    void Socket()
    {
        listen_sock = socket(AF_INET, SOCK_STREAM, 0);
        if (listen_sock < 0)
        {
            LOG(FATAL, "socket error!");
            exit(1);
        }
        int opt = 1;
        setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
        LOG(INFO, "create socket ... success");
    }

    //绑定IP和端口
    void Bind()
    {
        struct sockaddr_in local;
        memset(&local, 0, sizeof(local));
        local.sin_family = AF_INET;
        local.sin_port = htons(port);
        local.sin_addr.s_addr = INADDR_ANY; // 云服务器不能直接绑定公网IP

        if (bind(listen_sock, (struct sockaddr *)&local, sizeof(local)) < 0)
        {
            LOG(FATAL, "bind error!");
            exit(2);
        }
        LOG(INFO, "bind socket ... success");
    }

    //监听套接字
    void Listen()
    {
        if (listen(listen_sock, BACKLOG) < 0)
        {
            LOG(FATAL, "listen socket error!");
            exit(3);
        }
        LOG(INFO, "listen socket ... success");
    }
    int Sock()
    {
        return listen_sock;
    }
    ~TcpServer()
    {
        if (listen_sock >= 0)
            close(listen_sock);
    }
};

TcpServer *TcpServer::svr = nullptr;
